CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 189	$ 175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	74	62
Provision for doubtful accounts	3	2
Deferred income tax provision	24	11
Stock-based compensation expense	19	17
Other, net	(1)	1
Changes in operating assets and liabilities:
Accounts receivable	(97)	(35)
Accounts payable and accrued expenses	(68)	(95)
Income taxes payable	5	63
Other assets and liabilities, net	32	(5)
Net cash provided by operating activities	180	196
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(130)	(1)
Capital expenditures	(73)	(42)
Increase in investments and other assets	(1)	(4)
Net cash used in investing activities	(204)	(47)
Cash flows from financing activities:
Proceeds from borrowings	935	0
Repayments of debt	(832)	(2)
Purchases of treasury stock	(50)	(150)
Exercise of stock options	34	46
Employee payroll tax withholdings on stock issued under stock-based compensation plans	(20)	(22)
Dividends paid	(61)	(62)
Distributions to noncontrolling interests	(15)	(9)
Sale of noncontrolling interest in subsidiaries	2	0
Other financing activities, net	18	33
Net cash provided by (used in) financing activities	11	(166)
Net change in cash and cash equivalents and restricted cash	(13)	(17)
Cash and cash equivalents and restricted cash, beginning of period	137	384
Cash and cash equivalents and restricted cash, end of period	124	367
Cash and cash equivalents	137
Cash and cash equivalents and restricted cash, end of period	$ 137	$ 384